Fuse



Jan. 23, 1945. w SUMMERBELL 2,367,699

FUS E 1 Filed April 20, 1942 g] 1 vurzwbo'n- William Eiummerhel] attoq/m o latented Jan. 223, 1945 UNITED STATES FATENT OFFICE (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) 1 Claim.

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to a fuse, and in particular to a base impact fuse designed for delay action.

According to the invention a firing pin and primer move forward simultaneously at impact, the one against a spring retainer and the other freely, after shearing a retainer. On rebound of the spring held member, it contacts the other member which has meanwhile been trapped in it advanced position.

It is therefore an object of the invention to produce a fuse having a novel and improved delay action. It is a further object of the invention to produce a fuse wherein two separate firing components move forward simultaneously on impact followed by the return of one of the components for firing contact with the other.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawing in which:

Figures 1 to 3, inclusive, are axial sectional views of the fuse showing successive stages of operation, and

Figure 4 is a section on the line 44 of Figure 1.

Referring to the drawing by characters of reference, there is shown a fuse housing I capped by a member 2 hOllSlng a booster 3 secured by a retaining ring 4 and protected by a heat destructible disk 5.

Threadedly received in the housing I and engaging the base thereof is a ring member 6 axially bored in three stepped diameters 1, 8 and 9. snugly received in the smallest bore 1 is the shank II! of a firing pin I I, and a flange I2 on the shank Iii is received in the intermediate bore 8. A tail piece I3 of small d ameter protrudes from the flange I2 and rests on the bottom of the housing I. A-sheanpin I4 passes through ring member 6 and the shank III of the firing pin and is of such strength as to resist shearing during the accidental shocks of ordinary handling, such as dropping. If

A primer housing I has a flanged rim I6. resting on top of the face of the ring member 6 and in this position the primer capsule I'I retained by a ring I3.is spaced from the firing pin II when the latter is in fixed position. Between the flange I6 and the booster-retaining ring 4 is a compression spring I9.

A disk 20 is received on the tail I3 of the firing pin through an eccentric bore 2I in the disk.

Operation On firing, the forces of setback engender no fuse operations, since all moving parts are supported solidly to prevent rearward motion. On impact, the inertia of the primer carrier I8 will advance it against the pressure of spring I9, the inertia of the striker unit I0, II, I2, I3 will cause it to shear the pin I4 and advance the said unit slightly after the advance of the primer which has only the smaller force of the spring to overcome. The striker is limited in its forward motion by the fiange l2. The primer rebounds under action of the spring to engage the new advanced firing pin which is retained in its forward position by the disk 20, which, either through centrifugal action Or simply by its own Weight, is shifted to a position with its bore 2| out of line with the tail piece l3 on the striker.

'I'he fuse is of the impact type and may be used either as a base or a nose fuse. Likewise the primer and firing pin may be interchanged without departing from the spirit of the invention. The disk 20 could be omitted since the striker could be designed to hold frictionally, aided by inertia, after forward movement.

I claim:

A fuse comprising a casing having a bottom, a cylindrical member having an axial bore fixed in said casing, a first, large counterbore in said cylindrical member in the end thereof facing the bottom of the casing, a second, smaller counterbore in said cylindrical member, a firing pin fitted in said bore, shearable means attaching said firing pin to said cylindrical member, a flange on said firing pin of larger diameter than said bore and received in said smaller counterbore, a projecting portion on the rear of said firing pin rest-. ing on the bottom of said casing, a disk having an eccentric bore received on said projecting portion, the greatest radius of said disk being less than the radius of said larger counterbore and said disk being freely rotatable and slidable on,

said projecting portion, a primer capsule freely movable longitudinally of said casing, a compression spring holding said primer capsule in contact with said cylindrical member, and a primer in said primer casing spaced from said firing pin when the primer casing is in contact with said cylindrical member and the firing pin is held by said shearable means.

WILLIAM SUMMERBEIL. 

